1771-ID Isolated AC/DC Input Module – Product Overview
The Allen‑Bradley 1771‑ID is a 6‑channel isolated input module for the PLC‑5 platform. It accepts 120V AC/DC signals with individual channel isolation. Each channel operates independently at 92‑138V AC or DC. This module fits any 1771 I/O chassis and uses the 1771‑WD field wiring arm. It is ideal for isolated‑circuit multi‑phase applications and harsh industrial environments.
Key Technical Specifications
| Brand | Allen‑Bradley (Rockwell Automation) |
| Model / Series | 1771‑ID / PLC‑5 Product Bulletin |
| Input Channels | 6 individually isolated, dual‑rated (AC/DC) |
| Operating Voltage | 92‑138V AC (47‑63 Hz) or 92‑138V DC |
| Nominal Input Current | 8 mA @ 120V AC & 8 mA @ 120V DC |
| Input Signal Delay | AC ON/OFF: 24±10 ms ; DC ON: 10±4 ms ; DC OFF: 20±9 ms |
| Off‑State Current (max) | 1.7 mA (AC & DC) |
| Backplane Current Draw | 74 mA |
| Power Dissipation | 0.4 – 4.4 W (1.3 – 15.0 BTU/hr) |
| Isolation (opto‑electrical) | 1500V AC (rms) channel‑to‑channel / earth |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | ‑40°C to 85°C (‑40°F to 185°F) |
| Humidity (non‑condensing) | 5 – 95% RH |
| Keying Positions | Between 4‑6 and 28‑30 |
| Wiring Arm Torque | 7‑9 in‑lbs (0.79‑1.02 N·m) |
| Wire Size (solid/stranded) | 14 AWG, max insulation 3/64″ |
Installation & Compatibility
- Mounts in any 1771 I/O chassis – single slot occupancy.
- Use 1771‑WD field wiring arm for modular connections.
- Key the module between slots 4‑6 and 28‑30 to prevent mismating.
- Compatible with PLC‑5 processors and 1771 backplanes.
- Calculate total backplane current (74 mA per module) to avoid overload.
- Field wiring accepts 14 AWG copper wire (stranded or solid).
Diagnostic & Filtering Capabilities
- Built‑in input filtering reduces electrical noise and contact bounce.
- Delays are predictable: AC 24±10 ms; DC ON 10±4 ms; DC OFF 20±9 ms.
- Individual channel isolation allows mixing AC/DC loads per channel.
- Opto‑couplers provide 1500V AC isolation for robust noise immunity.
- Off‑state current ≤1.7 mA prevents false triggering.
Typical Applications
- Float switches, limit switches, pushbuttons, and selector switches.
- Multi‑phase isolated circuits in motor control centers.
- Industrial automation systems requiring mixed voltage inputs.
- Retrofit projects for obsolete PLC‑5 I/O banks.
Certification & Environmental Compliance
- Designed for industrial use; meets UL and CSA standards.
- Operating range: 0‑60°C, storage ‑40‑85°C, 5‑95% RH.
- Thermal dissipation 1.3‑15.0 BTU/hr – passive convection cooling.
- No special derating required under normal conditions.
Package Contents & Warranty
- Includes 1771‑ID module and 1771‑WD wiring arm.
- No additional accessories needed for standard installation.
- 12‑month warranty against manufacturing defects.
- Each unit verified with automated test equipment before shipping.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Global shipping – FedEx, UPS, DHL available.
- Tested surplus and refurbished options with full traceability.
- 12‑month warranty and technical verification prior to dispatch.
- Expert support for obsolete control systems (Modicon Quantum and others).
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